Formation and decomposition of methane hydrate in coal

Смирнов, В. Г.; Manakov, Andrey Yu.; Ukraintseva, E. A.; Villevald, Galina V.; Karpova, Tamara D.; Дырдин, В. В.; Lyrshchikov, S. Yu.; Ismagilov, Z. R.; Terekhova, I. S.; Ogienko, A. G.

doi:10.1016/j.fuel.2015.10.123

Cited by 38 publications

(13 citation statements)

References 23 publications

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“…In this connection, is it necessary to measure the hydrate capacity, that is, the maximal amount of the hydrate embedded in natural coal of one or another rank. The maximal amount of the hydrate is determined by the volume of coal pores with gas and water, sorbed by coal [14][15][16][17][18].…”

Section: Resultsmentioning

confidence: 99%

“…We carried out experiments with a series of coal samples in which we measured the amount of methane evolved during the decomposition of gas hydrates formed in these samples at a temperature and pressure close to the temperature and pressure in real coal beds [12,13,17,18]. Experiments were carried out in a closed autoclave, the amount of evolved gas was calculated from pressure rise.…”

Section: Resultsmentioning

confidence: 99%

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Effect of the Hydrate Saturation of the Pores of Coal Bed on the Gradient of Gas Pressure and the Rise of Outburst Danger

et al. 2019

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A substantial fraction of methane in undisturbed coal beds is present in the condensed latent state, so that methane evolution from coal may be not always quantitatively predicted reliably. On the basis of experimental data, an equation expressing the amount of gas hydrate through the sorption capacity and actual humidity of coal is obtained. Analysis showed that the gradient of gas pressure in the marginal zone of a coal bed is linearly dependent on the saturation of the pore space with the hydrate. The high gradient of gas pressure and high gas content of coal beds along with local disruption of coal and re-distribution of rock pressure are the major factors causing instantaneous outbursts of coal and gas.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effect of the Hydrate Saturation of the Pores of Coal Bed on the Gradient of Gas Pressure and the Rise of Outburst Danger

et al. 2019

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“…From works [5][6][7][8][9] it follows that in coal seams under certain thermobaric conditions and humidity at some distance from the mine face there can be the areas containing a solid coal gaseous solution.…”

Section: Methodsmentioning

confidence: 99%

Gas hydrates in coal seams and their impact on gas-dynamic processes in underground mining

et al. 2017

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Abstract. This paper deals with the development and analysis of the method of predicting gas-dynamic phenomena due to the gas hydrates in coal seams. With the help of the method of mathematical modelling the rate of dissociation of gas hydrates depending on the size of particles was determined as well as the correlation between the speed of moving the boundary line of the dissociation of gas hydrates in the pore space of coal and that of extending of the wave of crushing. The regularity of gas pressure distribution in a coal seam marginal zone after dissociation of gas hydrate depending on its saturation capacity and taking into account the changing coefficient of permeability of this zone was stated. It was also found that this kind of gas-dynamic processes in the presence of gas hydrates in the pore space of coals depends on critical value of permeability of a coal seam marginal zone.

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“…1) or gas -moisture, and states are divided by an equilibrium curve [7]. At a temperature about 10 °C transition of a methane from a hydrated state in gaseous is possible at sharp pressure drop from values above of 8 MPa (over a curve of phase change) to values of smaller 6 MPa (below a curve).…”

Section: Methodsmentioning

confidence: 99%

Gas Hydrates of Coal Layers as a Methane Source in the Atmosphere and Mine Working

2017

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Abstract. Living conditions of gas hydrates of a methane in a coal matrix as one of possible forms of finding of molecules of a methane in coal layers are considered. However, gas hydrates are formed not in all mineral coals even under the thermobaric conditions corresponding to their equilibrium state as the minimum humidity and the corresponding pore width are necessary for each brand of coal for formation of gas hydrate. It is shown that it depends on electric electrical dipole moment of a macromolecule of coal. Coals of brands K, D, Zh were considered. The electric field created by the surface of coal does not allow molecules of water to carry out threedimensional driving, and they keep on an internal surface of a time. By means of theoretical model operation a dipole -dipole interaction of molecules of water with the steam surface of coal values of energy of fiber interaction for various functional groups located in coal "fringe" which size for the first and second layers does not allow molecules of water to participate in formation of gas hydrates are received. For coals of brands K, Zh, D, considering distribution of a time on radiuses, the percent of moisture, which cannot share in education solid coal of gas solutions, is calculated.

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Formation and decomposition of methane hydrate in coal

Cited by 38 publications

References 23 publications

Effect of the Hydrate Saturation of the Pores of Coal Bed on the Gradient of Gas Pressure and the Rise of Outburst Danger

Effect of the Hydrate Saturation of the Pores of Coal Bed on the Gradient of Gas Pressure and the Rise of Outburst Danger

Gas hydrates in coal seams and their impact on gas-dynamic processes in underground mining

Gas Hydrates of Coal Layers as a Methane Source in the Atmosphere and Mine Working

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